池中水的深度是2m，月球到地球的距离为3.8×10⁵km，月球在池中的像到水面的距离是　 ____，水中的月是 ____像（填实或虚）．

①测定某有机物的相对分子质量，常用的方法是____（填字母）．

a．质谱法  b．燃烧法  c．核磁共振氢谱法

②下列有机物中核磁共振氢谱只有1个峰的是____（填字母）．

a．甲苯  b．新戊烷  c．乙醚

③1mol下列物质完全燃烧时，消耗3mol O₂的是____（填字母）．

a．乙炔  b．丁烷  c．乙醇．

   Television is good. You’d like to watch it all day and all night. But too much TV is a very bad thing. Scientists found that kids who watch too much TV may have more trouble learning to read. They can’t focus on their work.
   Kids learn language skills best by reading, talking and playing with others. If they spend too much time watching TV, they’ll have less time for those things. Watching too much TV is bad for people’s health. People don’t move much while watching TV. What’s more, they may eat a lot of food while watching. This can make them fat. We call these people couch potatoes.
   Fighting on TV is a big problem for kids. Yong people are good at following. Scientists have found that those who watch a lot of fighting shows are more likely to fight.